Supplementary Data File as used by JHM
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Discussion on Climate Audit
Supporting data sets as posted on PNAS website
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It turns out that the root of the problem is that the decadal average Z-scores shown in Thompson's Figure 6 and my Figure 1 above, and tabulated back to year 0 in Data Set 3, are not the decadal averages of the 5-year average Z-scores shown back to 1600 in Thompson et al.'s Figure 5 and in their Data Set 2:
The problem is not isolated to the data for just one region, since the two regional indices have the same problem:
However, the problem cannot just be that Figure 6 was computed from the same data but using standard errors for the 2000-year period instead of the 400-year period of Figure 5, since then there would still be an exact (though different) linear relation between the Figure 6 composites and decadal averages of the Figure 5 core data. As I show in my EE paper, no such linear relation exists.
So the problem still persists — which is the right data to use to construct an ice core temperature proxy? The data of Figure 5 (which although it only goes back to 1600 AD is at least identified by core number in DS2), or the (unspecified) data used to construct Figure 6?
Since Figure 5 is not representative of the data that was used to construct Figure 6, Thompson and co-authors have failed to provide, as required by the PNAS data policy, sufficient data to replicate his results. At a minimum they should identify the archived cores that were used to construct Figure 6, and provide detailed data for any unarchived cores that were used.